Scavenging port control



H. R SETZ.

SCAVENGING PORT CONTROL. APPLICATION HLED APIL II, 1921.

1,407,586, Patented Feb. 21, 1922;

3 SHEETS-SHEET l- INVENTOR flaws R Sefz ATTORNE Y5 H. R. SETZ.

SCAVENGING PORT CONTROL. APPLICATION men APR. 11, my.

Patented Feb. 21, 1922.

a SHEETSSHEET 2.

I NVENTOR l'lans R. Sefz WM ATTORNEYS H. R. SETZ.

SCAVENGING PORT CONTROL.

APPLICATION FILED APR. 11, 1921. 1,407,586, Patented Feb. 21, 1922 3 SHEETS-SHEET 3 INVENTOB #405 F Je/Z 5 Y (2 HT TOE/V5 Y5 UNITED STATES PATENT OFFICE.

HANS R. SETZ, 0F MANITOWOC, WISCONSIN.

SGAVENGING PORT CONTROL.

Application filed April 11, 1921.

To all whom it may concern:

Be it known that I, HANs R. Snrz, a citizen of the United States, residing at Manitowoc, \Visconsin, have invented a certain new and useful Improvement in Scavenging Port Control, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a scavenging port control arrangement of the general type disclosed in my pending application Serial 399,042, filed July 26, 1920 for two cycle internal combustion engine.

One object of my present invention is to provide a somewhat modified control arrangement for the specific purpose of hav ing each port controlled individually by its own control element.

Another object is to provide means where by each control element may be rendered inoperative, thereby cutting out any individual port without affecting the supply of scavenging air to adjacent ports.

Figure 1 of the drawings is a vertical sectional view, illustrating a port control arrangement embodying my invention.

Figure2 is a horizontal sectional view through the scavenging and exhaust ports of the cylinder shown in Figure 1.

Figure 3 is a side elevational view of one of the valve strips.

Figure 4: is a horizontal sectional view of one of the valve cages.

Figure 5 is an end elevational View of said valve cage.

Figure (5 is a vertical sectional view of said cage; and

Figure 7 is a vertical sectional view, illustrating a modification of my invention.

Referring to the drawings, 1 designates a cylinder provided with exhaust ports 2 and scavenging ports 3 arranged diametrically opposite the exhaust ports. The scavenging ports are of equal or slightly greater length than the exhaust ports and are preferably in the form of radially-disposed pas sages-in the side wall of the cylinder, extending from the interior to the exterior of the cylinder. The cylinder section containing these passageways is surrounded by an air receiver 4;,which may be of any suitable construction, so long as it is of such design that itwill supply pre-compressed scaveng- Specifieation of Letters Patent.

Patented Feb. 21, 1922.

Serial No. 460,533.

ing air to the circumferentially-disposed scavenging air passageways whose outer ends terminate in the outer contour of the cylinder, or merely serves as a guard or silencer if scavenging air of atmospheric pressure is used.

An automatic controlling element is associated with each of the scavenging ports, and in the form of my invention shown in figures 1 to 6, inclusive, each of said controlling elements consists of a cage 5 on which one or more valves are mounted. If the cage is provided with a plurality of valves, as herein shown, each of said valves is preferably formed from a light strip of steel or other suitable material rigidly held at one end so as to be guided without friction, and normally held by its own elasticity against a flat seat on the valve cage 5.

As shown in the drawings, each of the valve cages 5 consists of a hollow member arranged in the outer end of the scavenging air passageway with which it (Jo-operates and bifurcated vertically so as to form two fiat valve seats 15 that face each other and which are arranged at an approximately acute angle to each other, as shown in Figure 4-, each of said valve seats 15 being preferably provided with a vertical row of holes or openings 9 through which the scaveng ing air passes in entering the scavenging air port or passageway 3 in which said cage is arranged. Two flat strips of metal C that constitute the valves are mounted upon the angularly-disposed surfaces 15 and are retained in position by a wedge-shaped member 10 that is secured to the valve cage by bolts 11 or other suitable fastening devices, each of the valves or valve strips C being slotted or bifurcated horizontally, as shown in Figure 3, so as to form a plurality of fingers 6 that lap over the holes 9 in the valve cage. The contour of the wedgeshaped member 10 is such as to result in easy and uniform deflection of the fingers 6 of the valves when the scavenging air rushing through the openings 9 in the valve cage into the scavenging air passageways 3 causes said fingers 6 to lay against the side faces of the wedge-shaped member 10, it being, of course, understood that the valves open antomatically when the pressure in the reservoir 4L exceeds the pressure in the cylinder. In a scavenging valve structure of the char- V with such a slide.

enging port 3 of the cylinder can be cut acter above described the valves automatically uncover a large passage area at the slightest pressure difference. Furthermore, the valves and the openings in the valve cages through which the scavenging air is admitted are so disposed that there will be no eddy currents or turbulency in the in flowing streams of scavenging air, thus tendingto insure precise valve action and introduction of the scavenging air into the cylinder in clearly defined paths.

In order that the supply of scavenging air to the cylinder may bediminished, and in order that the particular point or points at which the scavenging air is introduced into the cylinder may be accurately controlled, I have provided means whereby any one of the automatic controlling elements that is associated with the respective scavenging ports 3 can be cutout of service without affecting the operation of the remainingcontrolling elements. In the form of my invention illustrated in- Figures 1 to 6, said means consists of slides 7 arranged 'to slide vertically in guideways formed by plates 8 and vertical grooves in the outer ends of the valve cages 5 and equipped with actuatin devices 7 that project upwardly through the top wall of the scavenging air receiver 4, as shown in Figure 1, each of the valve cages being equipped Consequently, any scavout'oi service while the engine is in operation without aii ecting the admission of scavenging air through the other ports, by sim ply depressing the slide valve 7 associated with the scavenging port which it is desired to cut out of operation, the movement of theslide valve into its closed position causing the scavenging air eceiver to be out off from the cage 5 in which said slide valve is mounted.

It is to be understood that the bifurcated surfaces 15 on cage 5 might be placed at a right angle to the position shown in Fig ures 1 to 6 without detracting from the spirit oif'this invention; in this case the strips forming the automatic valves would be held in a substantially horizontal position. i v

Figure 7 shows identically the same valve construction as is contained in -my pending application previously referred to; to this has been added the slide 7 on the'outer face of cage 5 in a similar manner and for the same purpose as described above;

A valve structure of" the kind above clescribed embodies all of the good features and characteristics of the valve structure described in my pending application previously referred to, but it differs slightly from the particular species of my invention therein claimed. 7 "1st. In the form and arrangement of the cages and valves of the automatic controlling elements for the scavenging air; and

2nd. In that a means separate and distinct from the valvecages is provided for enabling a particular scavenging port to be cut out of service without affecting the admis sion of scavenging air through the other ports.

Having thus described my invention, what i claim as new and desire to secure by Letters Patent, is:' v

1. A two-cycle internal combustion engine, comprisinga cylinder having a plurality t scaven gingair ports that-terminate in the inner face of the sidewall of the cylinder, and automatic controlling elements corresponding in number to the number of said ports and each associated with a particular port whereby the admission of the scavenging air to the cylinder through said ports can be accurately governed'by said controlling elements. 7

2. A two-cycle internal combustion" engine, comprisinga cylinder having exhaust ports and scavenging ports, an individual passageway leading from the outer cylinder wall to each of said scavengingports, and an automatic controlling element associated with each of said ports. 7

3. A two-cycle internal combustion engine comprising a cylinder having a plurality of radially-disposed scavenging air v passageways whose inner ends terminate'in the inner face of the side wall ofthe cylinder and whose outer ends communicate with a scavenging air receiver, and automatic controlling elements corresponding in number to the number of said passageways and each associated with a particular passageway so as to accurately govern the admission of scavenging air to the cylinder from said receiver. V

4. A two-cycle internal combustion engine comprising a cylinder having exhaust ports and scavenging ports, radially-disposed passageways leading from the outer cylinder wall to each of said scavenging ports, a scavenging air receiver surrounding the-portion of the cylinder in which said passageways terminate, and an automatic controlling element associated with each ofsaid ports for governing the admission of seavenging air to same from said receiver.

5. A two-cycle internal combustion engine, comprising a cylinder having a plurality of radially-disposed scavenging air passage ways formed in the side wall ofsameand terminating in the inner face of said side wall, a scavenging air receiver surrounding 6. A two-cycle internal combustion engine, comprising a cylinder having a plurality or scavenging ports which extend as individual passageways to the outer cylinder wall, andlan automatic controlling element arranged -within each or" said passageways.

7'. A two-cycle internal combustion engine, comprising a cylinder having a plurality of radially-disposed scavenging air passageways formed in the side wall of same and terminating in the inner face of said side wall, automatic controlling elements corresponding in number to the number of said passageways and each associated with one of: said passageways for governing the admission of scavenging air to that particular passageway from a source of supply, and means whereby any one of said controlling elements can be rendered inoperative with out affecting the operation of the remaining controlling elements.

8. A two cycle internal combustion engine, comprising a cylinder having a plurality of scavenging ports which extend as individual. passageways to the outer cylinder wall, an automatic controlling element arranged within each oi? said passageways, and means whereby any one of said controlling elements can be rendered inoperative.

9. A two-cycle internal combustion engine, comprising a cylinder having a plurality of scavenging ports which extend as individual passageways to the outer cylinder wall, a scavenging air receiver surrounding the cylinder portion which contains the intake openings to said passageways, an automatic controlling element arranged within each of said passageways, and means whereby any of said controlling elements can be rendered inoperative without afiecting the operation of the remaining controlling elements.

10. A two-cycle internal combustion engine provided with a cylinder equipped with scavenging ports, and a control unit associated with each of said ports -for governing the admission oi scavenging air to the cylinder through that particular port and consisting of a cage, an automatic valve in said cage, and a means independent of said cage for enabling said valve to be rendered inoperative without aiiecting the operation or" the valves of the remaining control units.

11. A two-cycle internal combustion engine provided with a cylinder equipped with scavenging ports, controlling elements for governing the supply of scavenging air to said ports comprising cages and automatic valves in said cages, and cut-oil devices separate and distinct from said cages which permit one or more of the controlling elements to be rendered inoperative without aiiecting the operation of the remaining controlling elements.

12. A two-cycle internal combustion engine provided with a cylinder equipped with scavenging ports, a scavenging air reservoir, controlling devices for governing the admission oi' scavenging air from said reservoir to the said ports comprising and automatic valves combined with said cages, and cut-ofi' devices arranged between said cages and reservoir, for the purpose described. I

13. A two-cycle internal combustion engine, comprising a cylinder provided in its side wall with radially-disposed scavenging ports, a controlling element associated with each of said ports consisting of a stationary cage and an automatic valve in said cage, and a manually-operable device associated with each cage that is adapted to be moved into a position to cut oil communication between the valve in the cage and a supply oi scavenging air.

14. A tw0-cycle internal combustion engine, comprising a cylinder provided in its side wall with a plurality of radially-disposed scavenging ports or passageways that lead from the interior to the exterior of the cylinder, a scavenging air reservoir surrounding the portion of the cylinder in which said passageways are formed, station ary cages in the outer ends of said passageways, automatic valves in said cages, and manually-operable cut-off devices on said cages, for the purpose described.

15. A two-cycle internal combustion engine comprising a cylinder provided in its side wall with radially-disposed scavengii ports or passageways, an illltOlTlZllllC controlling element associated with each of said ports and consisting of a cage and a valve on said cage formed from a thin strip of metal having one of its ends secured, and means to limit the deflection of the free end of said strip along a predetermined contour,

16. A two-cycle internal combustion engino, comprising a cylinder provided in its side wall with radially-disposed scavenging ports or passageways, an automatic controlling element associated with each of said ports and consisting of a cage and a valve on said cage formed from a thin strip of metal having one of its ends secured and adapted to be retained by its own resiliency in engagement with a fiat seat on said cage, and a device on said cage for rendering said valve inoperative. 4

1.7. A twocycle internal combustion engine, comprising a cylinder provided with radially-disposed scavenging air ports or passageways, a scavenging air reservoir surrounding the portion of the cylinder in which said ports are formed, a hollow valve cage arranged in the outer end of each of said passageways and provided with a flat valve seat having holes therein through which the scavenging air can enter from said reservoir, an automatic controlling valve provided with resilient fingers that nordescribed.

18. A two-cycle internal combustion engine, comprising a cylinder provided with scavenging ports, and an automatic c0ntr0lling element associated with each oi said ports and comprising a, hollow valve cage providedwvith a bifurcated portion having two engularly-disposed valveseats therein, a pair of resilient valves mounted On said valve seats and a Wedge-shaped device interpcsed between said valves and secured to said cage to retain the valves in position;

HANS R. sETz-. 

